<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<title>nrf51/Board/nrf6310/pwm_analyzer/main.c Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css" />
<link href="doxygen.css" rel="stylesheet" type="text/css" />
<link href="alias.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="alias.js"></script>

<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<script type="text/javascript">
  $(document).ready(initResizable);
</script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/search.js"></script>
<script type="text/javascript">
  $(document).ready(function() { searchBox.OnSelectItem(0); });
</script>


<script type="text/javascript">
  jQuery(document).ready(function () {
    if(gref){ // Number all _img and _table classes
      gref();
    }
  });
</script>

</head>
<body>
<div id="top"><!-- do not remove this div! -->

<div id="titlearea">
<table cellspacing="0" cellpadding="0">
 <tbody>
 <tr style="height: 56px;">
  
  
  <td style="padding-left: 0.5em;">
   <div id="projectname">nRF51 General Code Examples
   
   </div>
   
  </td>
  
  
  
 </tr>
 </tbody>
</table>
</div>

<!-- Generated by Doxygen 1.7.5 -->
<script type="text/javascript">
var searchBox = new SearchBox("searchBox", "search",false,'Search');
</script>
  <div id="navrow1" class="tabs">
    <ul class="tablist">
      <li><a href="index.html"><span>Main&#160;Page</span></a></li>
      <li><a href="modules.html"><span>Modules</span></a></li>
      <li><a href="annotated.html"><span>Data&#160;Structures</span></a></li>
      <li class="current"><a href="files.html"><span>Files</span></a></li>
      <li>
        <div id="MSearchBox" class="MSearchBoxInactive">
        <span class="left">
          <img id="MSearchSelect" src="search/mag_sel.png"
               onmouseover="return searchBox.OnSearchSelectShow()"
               onmouseout="return searchBox.OnSearchSelectHide()"
               alt=""/>
          <input type="text" id="MSearchField" value="Search" accesskey="S"
               onfocus="searchBox.OnSearchFieldFocus(true)" 
               onblur="searchBox.OnSearchFieldFocus(false)" 
               onkeyup="searchBox.OnSearchFieldChange(event)"/>
          </span><span class="right">
            <a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a>
          </span>
        </div>
      </li>
    </ul>
  </div>
  <div id="navrow2" class="tabs2">
    <ul class="tablist">
      <li><a href="files.html"><span>File&#160;List</span></a></li>
      <li><a href="globals.html"><span>Globals</span></a></li>
    </ul>
  </div>
</div>
<div id="side-nav" class="ui-resizable side-nav-resizable">
  <div id="nav-tree">
    <div id="nav-tree-contents">
    </div>
  </div>
  <div id="splitbar" style="-moz-user-select:none;" 
       class="ui-resizable-handle">
  </div>
</div>
<script type="text/javascript">
  initNavTree('nrf6310_2pwm__analyzer_2main_8c.html','');
</script>
<div id="doc-content">
<div class="header">
  <div class="headertitle">
<div class="title">nrf51/Board/nrf6310/pwm_analyzer/main.c</div>  </div>
</div>
<div class="contents">
<a href="nrf6310_2pwm__analyzer_2main_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.</span>
<a name="l00002"></a>00002 <span class="comment"> *</span>
<a name="l00003"></a>00003 <span class="comment"> * The information contained herein is confidential property of Nordic</span>
<a name="l00004"></a>00004 <span class="comment"> * Semiconductor ASA.Terms and conditions of usage are described in detail</span>
<a name="l00005"></a>00005 <span class="comment"> * in NORDIC SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Licensees are granted free, non-transferable use of the information. NO</span>
<a name="l00008"></a>00008 <span class="comment"> * WARRANTY of ANY KIND is provided. This heading must NOT be removed from</span>
<a name="l00009"></a>00009 <span class="comment"> * the file.</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> */</span>
<a name="l00012"></a>00012 
<a name="l00025"></a>00025 <span class="preprocessor">#include &lt;stdbool.h&gt;</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include &lt;stdint.h&gt;</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include &quot;nrf.h&quot;</span>
<a name="l00028"></a>00028 <span class="preprocessor">#include &quot;nrf_gpiote.h&quot;</span>
<a name="l00029"></a>00029 <span class="preprocessor">#include &quot;nrf_gpio.h&quot;</span>
<a name="l00030"></a>00030 
<a name="l00031"></a><a class="code" href="group__pwm__analyzer__example.html#ga0cc984ffe17239c0324f1a5d62708d98">00031</a> <span class="preprocessor">#define INPUT_PIN_NUMBER (18UL) </span>
<a name="l00032"></a><a class="code" href="group__pwm__analyzer__example.html#ga57f5b1674cba3334ccbb1d2682350bdd">00032</a> <span class="preprocessor">#define DUTY_CYCLE_SCALE_VALUE (256UL) </span>
<a name="l00034"></a>00034 <span class="preprocessor">static void timer1_init(void);</span>
<a name="l00035"></a>00035 <span class="preprocessor"></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__pwm__analyzer__example.html#gad22626704ea5d45f863163500e355cc3">gpiote_init</a>(<span class="keywordtype">void</span>);
<a name="l00036"></a>00036 <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__pwm__analyzer__example.html#gaad16890c50156256e260b5205571ddc4">ppi_init</a>(<span class="keywordtype">void</span>);
<a name="l00037"></a>00037 
<a name="l00042"></a><a class="code" href="group__pwm__analyzer__example.html#ga840291bc02cba5474a4cb46a9b9566fe">00042</a> <span class="keywordtype">int</span> <a class="code" href="group__gpio__example.html#ga840291bc02cba5474a4cb46a9b9566fe">main</a>(<span class="keywordtype">void</span>)
<a name="l00043"></a>00043 {
<a name="l00044"></a>00044   <a class="code" href="group__pwm__analyzer__example.html#gad22626704ea5d45f863163500e355cc3">gpiote_init</a>();
<a name="l00045"></a>00045   <a class="code" href="group__pwm__analyzer__example.html#gaad16890c50156256e260b5205571ddc4">ppi_init</a>();
<a name="l00046"></a>00046   <a class="code" href="group__pwm__analyzer__example.html#ga43132496bef9b695b89b05793586aa27">timer1_init</a>();
<a name="l00047"></a>00047 
<a name="l00048"></a>00048   NVIC_EnableIRQ(GPIOTE_IRQn);
<a name="l00049"></a>00049   __enable_irq();
<a name="l00050"></a>00050 
<a name="l00051"></a>00051   <span class="keywordflow">while</span> (<span class="keyword">true</span>)
<a name="l00052"></a>00052   {
<a name="l00053"></a>00053   }
<a name="l00054"></a>00054 }
<a name="l00055"></a>00055 
<a name="l00058"></a><a class="code" href="group__pwm__analyzer__example.html#ga43132496bef9b695b89b05793586aa27">00058</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__pwm__analyzer__example.html#ga43132496bef9b695b89b05793586aa27">timer1_init</a>(<span class="keywordtype">void</span>)
<a name="l00059"></a>00059 {
<a name="l00060"></a>00060   <span class="comment">/* Start 16 MHz crystal oscillator */</span>
<a name="l00061"></a>00061   NRF_CLOCK-&gt;EVENTS_HFCLKSTARTED = 0;
<a name="l00062"></a>00062   NRF_CLOCK-&gt;TASKS_HFCLKSTART = 1;
<a name="l00063"></a>00063 
<a name="l00064"></a>00064   <span class="comment">/* Wait for the external oscillator to start up */</span>
<a name="l00065"></a>00065   <span class="keywordflow">while</span> (NRF_CLOCK-&gt;EVENTS_HFCLKSTARTED == 0) 
<a name="l00066"></a>00066   {
<a name="l00067"></a>00067   }
<a name="l00068"></a>00068 
<a name="l00069"></a>00069   <span class="comment">// Start to power up TIMER1 peripheral</span>
<a name="l00070"></a>00070   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_TIMER1_Power &lt;&lt; POWER_PERPOWER_TIMER1_Pos);
<a name="l00071"></a>00071 
<a name="l00072"></a>00072   <span class="comment">// Wait for power up</span>
<a name="l00073"></a>00073   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_TIMER1_Msk) != (POWER_PERRDY_TIMER1_Ready &lt;&lt; POWER_PERRDY_TIMER1_Pos))
<a name="l00074"></a>00074   {
<a name="l00075"></a>00075   }
<a name="l00076"></a>00076 
<a name="l00077"></a>00077   NRF_TIMER1-&gt;MODE = TIMER_MODE_MODE_Timer;
<a name="l00078"></a>00078   NRF_TIMER1-&gt;PRESCALER = 1;
<a name="l00079"></a>00079   NRF_TIMER1-&gt;TASKS_START = 1; <span class="comment">// Start clocks</span>
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081 
<a name="l00085"></a><a class="code" href="group__pwm__analyzer__example.html#ga26b108e2296d5514a2391960b4231d71">00085</a> <span class="keywordtype">void</span> <a class="code" href="group__adns2080__example.html#ga26b108e2296d5514a2391960b4231d71">GPIOTE_IRQHandler</a>(<span class="keywordtype">void</span>)
<a name="l00086"></a>00086 {
<a name="l00087"></a>00087   uint32_t duty_cycle;
<a name="l00088"></a>00088   uint32_t cycle_duration;
<a name="l00089"></a>00089 
<a name="l00090"></a>00090   cycle_duration = NRF_TIMER1-&gt;CC[0];
<a name="l00091"></a>00091   uint32_t active_time = NRF_TIMER1-&gt;CC[1];
<a name="l00092"></a>00092 
<a name="l00093"></a>00093   <span class="keywordflow">if</span> (cycle_duration != 0)
<a name="l00094"></a>00094   {
<a name="l00095"></a>00095     duty_cycle = (<a class="code" href="group__pwm__analyzer__example.html#ga57f5b1674cba3334ccbb1d2682350bdd">DUTY_CYCLE_SCALE_VALUE</a> * active_time) / cycle_duration;
<a name="l00096"></a>00096     <span class="comment">// Integer division always round down and the counting is not precise enough, add one.</span>
<a name="l00097"></a>00097     duty_cycle++;
<a name="l00098"></a>00098   }
<a name="l00099"></a>00099   <span class="keywordflow">else</span>
<a name="l00100"></a>00100   {
<a name="l00101"></a>00101     duty_cycle = 0x00;
<a name="l00102"></a>00102   }
<a name="l00103"></a>00103 
<a name="l00104"></a>00104   <a class="code" href="group__nrf__gpio.html#gac1d4940bc5ad4aad4f6363c7021b08ae" title="Write GPIO port.">nrf_gpio_port_write</a>(<a class="code" href="group__nrf__gpio.html#ggaa1a5c145e334817f2d960317d64fcb3da9209d7820d65eb58c7804e676581bf40" title="Port 1 (GPIO pin 8-15)">NRF_GPIO_PORT_SELECT_PORT1</a>, (uint8_t)duty_cycle);
<a name="l00105"></a>00105 
<a name="l00106"></a>00106   <span class="comment">// Event causing the interrupt must be cleared</span>
<a name="l00107"></a>00107   NRF_GPIOTE-&gt;EVENTS_IN[0] = 0;
<a name="l00108"></a>00108 }
<a name="l00109"></a>00109 
<a name="l00112"></a><a class="code" href="group__pwm__analyzer__example.html#gad22626704ea5d45f863163500e355cc3">00112</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__pwm__analyzer__example.html#gad22626704ea5d45f863163500e355cc3">gpiote_init</a>(<span class="keywordtype">void</span>)
<a name="l00113"></a>00113 {
<a name="l00114"></a>00114   <span class="comment">// Power ON the GPIOTE peripheral.</span>
<a name="l00115"></a>00115   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_GPIOTE_Power &lt;&lt; POWER_PERPOWER_GPIOTE_Pos);
<a name="l00116"></a>00116 
<a name="l00117"></a>00117   <span class="comment">// Wait for the power up.</span>
<a name="l00118"></a>00118   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_GPIOTE_Msk) != (POWER_PERRDY_GPIOTE_Ready &lt;&lt; POWER_PERRDY_GPIOTE_Pos))
<a name="l00119"></a>00119   {
<a name="l00120"></a>00120   }
<a name="l00121"></a>00121 
<a name="l00122"></a>00122   <span class="comment">// configure port1 (pins 8 -15) as outputs to show duty cycle</span>
<a name="l00123"></a>00123   <a class="code" href="group__nrf__gpio.html#ga08c820bf0360c7406b64ddaf3bfc7222" title="Configure GPIO pin range as outputs with normal drive strength. This function can be used to configur...">nrf_gpio_range_cfg_output</a>(8, 15);
<a name="l00124"></a>00124 
<a name="l00125"></a>00125   <span class="comment">// configure pin as input</span>
<a name="l00126"></a>00126   <a class="code" href="group__nrf__gpio.html#ga4e63d442ebd572126be3e030b3df4dc6" title="Configure given GPIO pin number as input with given initial value set, hiding inner details...">nrf_gpio_cfg_input</a>(<a class="code" href="group__pwm__analyzer__example.html#ga0cc984ffe17239c0324f1a5d62708d98">INPUT_PIN_NUMBER</a>, <a class="code" href="group__nrf__gpio.html#gga07e0c8c0b30499cf0a7b79dbe62d3fcca13ffcb94eb78be866c66b5f5b516af65" title="Pin pullup resistor disabled.">NRF_GPIO_PIN_NOPULL</a>);
<a name="l00127"></a>00127 
<a name="l00128"></a>00128   <span class="comment">// Enable interrupt on input 0 event.</span>
<a name="l00129"></a>00129   NRF_GPIOTE-&gt;INTENSET = (1UL &lt;&lt; GPIOTE_INTENSET_IN0_Pos);
<a name="l00130"></a>00130 
<a name="l00131"></a>00131   <span class="comment">// Configure GPIOTE channel 0 to generate event on input pin low-to-high transition.</span>
<a name="l00132"></a>00132   <span class="comment">// Note that we can connect multiple GPIOTE events to a single input pin.</span>
<a name="l00133"></a>00133   <a class="code" href="group__nrf__gpiote.html#gac04dde3ea740f163fa2ac032bf56152d" title="Config GPIOTE channel as input, automatically clearing an event that appears in some cases nder confi...">nrf_gpiote_event_config</a>(0, <a class="code" href="group__pwm__analyzer__example.html#ga0cc984ffe17239c0324f1a5d62708d98">INPUT_PIN_NUMBER</a>, <a class="code" href="group__nrf__gpiote.html#gga9a424db0997c11092f8f69d52155dd9da59dda358a841a81671bd372058b46498" title="Low to high.">NRF_GPIOTE_POLARITY_LOTOHI</a>);
<a name="l00134"></a>00134 
<a name="l00135"></a>00135   <span class="comment">// Configure GPIOTE channel 1 to generate event on input pin high-to-low transition.</span>
<a name="l00136"></a>00136   <span class="comment">// Note that we can connect multiple GPIOTE events to a single input pin.</span>
<a name="l00137"></a>00137   <a class="code" href="group__nrf__gpiote.html#gac04dde3ea740f163fa2ac032bf56152d" title="Config GPIOTE channel as input, automatically clearing an event that appears in some cases nder confi...">nrf_gpiote_event_config</a>(1, <a class="code" href="group__pwm__analyzer__example.html#ga0cc984ffe17239c0324f1a5d62708d98">INPUT_PIN_NUMBER</a>, <a class="code" href="group__nrf__gpiote.html#gga9a424db0997c11092f8f69d52155dd9da97c193ac03f0691bea38c2283b55fa8a" title="High to low.">NRF_GPIOTE_POLARITY_HITOLO</a>);
<a name="l00138"></a>00138 }
<a name="l00139"></a>00139 
<a name="l00142"></a><a class="code" href="group__pwm__analyzer__example.html#gaad16890c50156256e260b5205571ddc4">00142</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__pwm__analyzer__example.html#gaad16890c50156256e260b5205571ddc4">ppi_init</a>(<span class="keywordtype">void</span>)
<a name="l00143"></a>00143 {
<a name="l00144"></a>00144   <span class="comment">// Power ON the PPI peripheral</span>
<a name="l00145"></a>00145   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_PPI_Power &lt;&lt; POWER_PERPOWER_PPI_Pos);
<a name="l00146"></a>00146 
<a name="l00147"></a>00147   <span class="comment">// Wait for the power up</span>
<a name="l00148"></a>00148   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_PPI_Msk) != (POWER_PERRDY_PPI_Ready &lt;&lt; POWER_PERRDY_PPI_Pos))
<a name="l00149"></a>00149   {
<a name="l00150"></a>00150   }
<a name="l00151"></a>00151 
<a name="l00152"></a>00152   <span class="comment">// Configure PPI channel 0 to capture Timer 1 value into CC[0] register when GPIOTE detects Low-to-High transition on pin INPUT_PIN_NUMBER.</span>
<a name="l00153"></a>00153   NRF_PPI-&gt;CH0_EEP = (uint32_t)&amp;NRF_GPIOTE-&gt;EVENTS_IN[0];
<a name="l00154"></a>00154   NRF_PPI-&gt;CH0_TEP = (uint32_t)&amp;NRF_TIMER1-&gt;TASKS_CAPTURE[0];
<a name="l00155"></a>00155 
<a name="l00156"></a>00156   <span class="comment">// Configure PPI channel 1 to clear Timer 1 when GPIOTE detects Low-to-High transition on pin INPUT_PIN_NUMBER.</span>
<a name="l00157"></a>00157   NRF_PPI-&gt;CH1_EEP = (uint32_t)&amp;NRF_GPIOTE-&gt;EVENTS_IN[0];
<a name="l00158"></a>00158   NRF_PPI-&gt;CH1_TEP = (uint32_t)&amp;NRF_TIMER1-&gt;TASKS_CLEAR;
<a name="l00159"></a>00159 
<a name="l00160"></a>00160   <span class="comment">// Configure PPI channel 2 to capture Timer 1 value into CC[1] register when GPIOTE detects High-to-Low transition on pin INPUT_PIN_NUMBER.</span>
<a name="l00161"></a>00161   NRF_PPI-&gt;CH2_EEP = (uint32_t)&amp;NRF_GPIOTE-&gt;EVENTS_IN[1];
<a name="l00162"></a>00162   NRF_PPI-&gt;CH2_TEP = (uint32_t)&amp;NRF_TIMER1-&gt;TASKS_CAPTURE[1];
<a name="l00163"></a>00163 
<a name="l00164"></a>00164   <span class="comment">// Enable only PPI channels 0, 1 and 2</span>
<a name="l00165"></a>00165   NRF_PPI-&gt;CHEN =    (PPI_CHEN_CH0_Enabled &lt;&lt; PPI_CHEN_CH0_Pos)
<a name="l00166"></a>00166                 | (PPI_CHEN_CH1_Enabled &lt;&lt; PPI_CHEN_CH1_Pos)
<a name="l00167"></a>00167                 | (PPI_CHEN_CH2_Enabled &lt;&lt; PPI_CHEN_CH2_Pos);
<a name="l00168"></a>00168 }
<a name="l00169"></a>00169 
<a name="l00170"></a>00170 
</pre></div></div>
</div>
  <div id="nav-path" class="navpath">
    <ul>
      <li class="navelem"><a class="el" href="nrf6310_2pwm__analyzer_2main_8c.html">main.c</a>      </li>
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
     onmouseover="return searchBox.OnSearchSelectShow()"
     onmouseout="return searchBox.OnSearchSelectHide()"
     onkeydown="return searchBox.OnSearchSelectKey(event)">
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark">&#160;</span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark">&#160;</span>Data Structures</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark">&#160;</span>Files</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark">&#160;</span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark">&#160;</span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark">&#160;</span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark">&#160;</span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark">&#160;</span>Defines</a></div>

<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0" 
        name="MSearchResults" id="MSearchResults">
</iframe>
</div>


    <li class="footer">
      Copyright &copy 2006-2011 <a href="http://www.nordicsemi.no" style="text-decoration:none">Nordic Semiconductor</a>.
      All Rights Reserved.
      <a href="disclaimer.html">Disclaimer</a>
    </li>
   </ul>
 </div>


</body>
</html>
